GTR 993

The 1995 993 has 272 hp and the 1996 has 282 hp where is the difference at? What option produced an additional 10 HP, I have a 95 and want to push just slightly over 300 hp, I would like to be in the 300 - 315 range. Is there fairly simple mods to get me to these numbers. I was looking at Exhaust,Chip,Intake and possibly headers. Any suggestions for a quick jump in HP to keep me satisfied for say a month or so. I have to admit I can't stop there but I am trying to slow the process down a bit. Thanks for any info. <img src="graemlins/jumper.gif" border="0" alt="[jumper]" />

tom_993

Since you have a ’95, the single best thing you can do is to chip it. That will get you 10-15 HP, although some vendors will claim more.

Getting to 300-315 is nearly impossible, unless you spend big bucks and make lots of internal changes (e.g. 3.8 liters or superchargers). I don’t believe you can get to 315 with chips, exhaust and intake type changes. Again, the vendors will claim otherwise.

Tom
’95 993

STLPCA

[quote]Originally posted by GTR 993:
<strong>I have a 95 and want to push just slightly over 300 hp, I would like to be in the 300 - 315 range. Is there fairly simple mods to get me to these numbers.</strong><hr></blockquote>

No - nothing simple (or inexpensive) will buy you another 30+ HP. Conversion to Varioram is neither practical nor cost effective. There have been many extensive threads on engine mods, aftermarket turbos, supercharger kits, free flow exhausts, headers, etc. that can be found by searching the archives. I've posted a few below.

Bottom line is Porsche squeezed out all the easy and the not so easy gains. The incremental cost of added HP for these cars is quite high & is non linear.

<a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=3&t=002076" target="_blank">Varioram upgrade for older 993's </a>

<a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=3&t=000149" target="_blank">993 Engine Performance Upgrades </a>

<a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=3&t=000270" target="_blank">ECU Chips </a>

<a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=3&t=001689" target="_blank">Performance Chips - Feeback PLEASE! </a>

GTR 993

Thank You for the information, I will start with a chip and work up from there. Any suggestions on a chip? I have been looking at a weltmeister (Hopefully my spelling is correct) Has anyone used this chip and had good luck with it? I am open to any ideas. Thanks Again

Martin S.

First thing lets recognize, you can get used to anything. If you pumped up your 993 to 315 HP, sooner or later, that would seem slow to you..it is the human condition that leads us to create, we are never satisfied.

To gain perspective on your request for additional horsepower, consider what Porsche has done to get the HP to the present level on the 993. They optimized the electronic ignition, gave you 2 plugs per cylinder, they integrated a header system that defies improvement, the mufflers are free flowing and they provided you with 3.6 liters of displacement. For later models, they provide Varioram, for added HP and mid-range torque.

Better yet, consider what the Porsche factory has had to do to squeeze out an additional 20 to 40 HP out of the boxer motor for the 996. They had to go to 4 valves per cylinder and variable valve timing...and they clened up the 996 exhaust. These are major modifications, and they really didn't get that much HP fore their efforts. But they know we will never be happy, we always want more...ergo, that is how they sell cars.

In summary, there are no cheap ways to get added HP on the 993 motor. THe cheapest and easiest way is to remove HP, supposed 10 HP improivement for each 100 Lbs removed. Change out the factory seats is a good start.

Another avenue is changes to the drive train. You could change the Ring and Pinion for a 15% improvement (gear reduction). This will cost you about $4,000.

The 993 car really shines on the track, especially when running with other brands of cars. If you do this, you'll truly appreciate the gem that you have. I love my car and am happy with the 282 HP...now all I have to do is learn to drive the car to its potential, a life long chore, albeit a pleasant one.

maurice97C2S

Someone here in England has had around 320 bhp on 3.6 litre 993 with inlet, exhaust and management changes. Using the Motec 6 butterfly inlet setup. Must be in the archives somewhere.

The short tract individual butterly inlet has been used to v good effect by BMW Mptorsport since early '80s - my old '88 M635 had 286 bhp from 3.4 litres, 4 valves single ignition, M3s have been &gt;100 bhp per litre since E36 Evo of around '95, and all very well behaved! Gives excellent throttle response, of course! Now if BMW would build a real sports car instead of a modified saloon - suppose the McLaren is it, but a trifle expensive.

Ramble mode off, cheers, Maurice

Ray Calvo

"where is the difference at"
Probably mostly in your mind. Doubt if you can really feel 10 HP difference.

I'm prob. prejudice, but I tried a bunch of different chips on my '84 Carrera. A few felt quicker till I did some timed 3rd gear, 3000-6000 RPM accelleration tests along a set road section. Differences between chips was well within the tolerance difference beween different tests with the same chip. It's amazing what your mind does to justify you just spending umpteen hundreds of $$$$; feel much of folks saying car is "faster" is really a psychological improvement.

Most chips will increase the RPM cutoff. I've heard this is a bad thing to do with the hydraulic valve lifters on these cars.

Unless you strip the hell out of the car and really modify the engine to a race setup, I doubt that any change you make will make a significant difference in accelleration.

Any moron can floor the accellerator; the real trick and enjoyment on these cars is knowing how/when to nail the brakes and then release them and turn into a tight corner and accellerate out.

PeanutinCA

GTR 993,
most of the points here are all quite valid. Doesn't make you not want to make the changes any less though right!! Take on all the information here and process it as you see fit. But my suggestion, I will make many of these changes too, BUT and the big BUT(T), I will try to do them all at once. I have a chip sitting there, but not installed, I will get the exhaust soon, I already did the airbox drilling (before I decided to wait), will do the seats and remove about another 20 odd pounds of stereo equipment that was installed in my car. My hope is, that with all things done at once, I may then notice some improvements?

I agree with Martin here, think about the feel of your car with your friend in the passenger seat, then take them out. It's a noticeable difference to the driver, if you truely feel your car (in the non-biblical sense) then you will feel the change from weight reduction. Search for prior threads on weight reduction and FWIW, try make most changes at the same time for the biggest seat of the pants benefit.

Cheers,
Dylan.

993Widebody

All the above posts sum it up well. You can get about 15hp by changing the exhaust and chipping the car, but that's about it. I don't even think you will notice much of a difference, and if you do... well you won't for long. The amount of money it will cost you for the 15HP, which is what, a 5 percent increase is IMO not worth it.

Recently I put a Fabspeed supercup exhaust on the car. This exhaust ( or should I say set of nice pipes) is very loud, very deep and has the coolest chain saw deep growl sound I have ever heard. The exhaust ways about 30lbs less than stock, and probably gives about 5-10hp. But that is not the kicker, you actually feel like you just bumped your horsepower by 50hp because of the aural sensation. Very worth the money and probably the cheapest way to make you feel like you are going really fast.

Have Fun!

993C4

Why not consider a weight loss program. Surely it's easier than increasing HP? And you will not encounter and engine reliablity issues. Perhaps Aluminium doors+hood, RS windows, lightweight seats/rims, removing back seats, sound proofing etc

993C4 Cab

993RS

IMHO: The best mod is to switch to RoW gearing. Does not touch the engine and you really feel the difference.

Phil

all of the 993's above this response....are my next projects.....gonna go on a diet(for the car)..ok me too!!!.....regear tranny!!!!....and gonna do a lighter exaust.....But I will say....My ecu remapped by SteveW.....ROCKS&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; &gt;sorry...

Vinny '98 3.8 C2S

Martin responded &gt;&gt;First thing lets recognize, you can get used to anything. If you pumped up your 993 to 315 HP, sooner or later, that would seem slow to you..it is the human condition that leads us to create, we are never satisfied.&gt;&gt;

I totally disagree. I'm much too reasonable for that line of thinking. By the way, does anyone know whether a 3.9 upgrade is available?

Jeff C

I have seen a supercharger discussed on the board that seemed to offer a fair increase in hp.